HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onkeyup — live filter</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;font-size:.8125rem;font-weight:500;margin-bottom:.35rem}input{display:block;width:100%;max-width:280px;padding:.5rem .75rem;border:1px solid #cbd5e1;border-radius:8px;font-size:.875rem;margin-bottom:.75rem}#searchResult{padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <h1>Search on keyup</h1>

  <p>Results update each time you release a key.</p>

  <label for=search>Search</label>

  <input id=search onkeyup=searchFunction()>

  <p id=searchResult>Type to filter fruits…</p>



  <script>var fruits=["Apple","Banana","Orange","Grape","Mango"];function searchFunction(){var e=document.getElementById("search").value.toLowerCase(),t=fruits.filter((function(t){return-1!==t.toLowerCase().indexOf(e)}));document.getElementById("searchResult").textContent=t.length?"Results: "+t.join(", "):"No results"}</script>

</body>

</html>

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HTML onkeyup Attribute — Live fruit filter